County annual report · FIPS 30091
2019 Sheridan County, MT Power Outage Report
In 2019, customers in Sheridan County, MT went without power for an average of 2.8 hours, a total of 5,015 customer-hours (Montana average 0.6 hours). That ranks 7th worst of 38 Montana counties and 1712th of 2,945 nationally.
Compared with MT, the US and 2018
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Sheridan County, 2019
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | April 28, 2019 17:30 | April 28, 2019 17:45 | 15m | 364 | 91 |
| 2 | June 28, 2019 06:30 | June 28, 2019 07:45 | 1h 15m | 224 | 280 |
| 3 | June 21, 2019 03:00 | June 21, 2019 10:00 | 7h | 221 | 1,476 |
| 4 | August 12, 2019 02:30 | August 12, 2019 02:45 | 15m | 134 | 34 |
| 5 | April 29, 2019 18:45 | April 29, 2019 22:15 | 3h 30m | 126 | 187 |
| 6 | August 15, 2019 04:15 | August 15, 2019 06:45 | 2h 30m | 126 | 261 |
| 7 | April 28, 2019 21:15 | April 28, 2019 22:15 | 1h | 94 | 25 |
| 8 | October 17, 2019 15:15 | October 17, 2019 18:15 | 3h | 74 | 222 |
| 9 | August 6, 2019 03:00 | August 6, 2019 03:15 | 15m | 70 | 18 |
| 10 | July 13, 2019 00:30 | July 13, 2019 01:30 | 1h | 53 | 40 |
Outage episodes by size in 2019: 6 reached 100+ customers, 0 reached 1,000+ customers, 0 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Sheridan County reported on EIA Form 861 for 2019, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Montana-Dakota Utilities Co | - | - | - | - | - |
| Sheridan Electric Coop, Inc | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 75% of Montana's customers in 2019; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 1,766 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Sheridan County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Sheridan County, MT annual power outage report, 2019, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/). https://massoutage.com/reports/2019/montana/sheridan-county